Uniweld G7S Gauge with 0-4000 PSI and 1/4-Inch NPT Bottom Mount Gold Steel Case, 2-Inch 2 Inch Gauge, 0-4000 PSI, UL Listed, Gold Steel Case 1/4 Inch NPT Bottom Mount Brass fitting that is corrosion resistant Oxygen cleaned welding gauge per (ANSI B401) Suitable for oxygen, nitrogen, fuel gases and medical equipment Recommended for use with compressed gas regulators